source/src/vm/mz700/cmos.cpp

   1 /*
   2         SHARP MZ-700 Emulator 'EmuZ-700'
   3         SHARP MZ-800 Emulator 'EmuZ-800'
   4         SHARP MZ-1500 Emulator 'EmuZ-1500'
   5
   6         Author : Takeda.Toshiya
   7         Date   : 2010.09.02 -
   8
   9         [ cmos memory ]
  10 */
  11
  12 #include "cmos.h"
  13
  14 #define DATA_SIZE       0x8000
  15 #define ADDR_MASK       (DATA_SIZE - 1)
  16
  17 void CMOS::initialize()
  18 {
  19         // init memory
  20         data_buffer = (uint8_t *)malloc(DATA_SIZE);
  21         memset(data_buffer, 0, DATA_SIZE);
  22         modified = false;
  23
  24         // load cmos image
  25         FILEIO* fio = new FILEIO();
  26         if(fio->Fopen(create_local_path(_T("CMOS.BIN")), FILEIO_READ_BINARY)) {
  27                 fio->Fread(data_buffer, DATA_SIZE, 1);
  28                 fio->Fclose();
  29         }
  30         delete fio;
  31 }
  32
  33 void CMOS::release()
  34 {
  35         // save cmos image
  36         if(modified) {
  37                 FILEIO* fio = new FILEIO();
  38                 if(fio->Fopen(create_local_path(_T("CMOS.BIN")), FILEIO_WRITE_BINARY)) {
  39                         fio->Fwrite(data_buffer, DATA_SIZE, 1);
  40                         fio->Fclose();
  41                 }
  42                 delete fio;
  43         }
  44
  45         // release memory
  46         free(data_buffer);
  47 }
  48
  49 void CMOS::reset()
  50 {
  51         data_addr = 0;
  52 }
  53
  54 void CMOS::write_io8(uint32_t addr, uint32_t data)
  55 {
  56         switch(addr & 0xff) {
  57         case 0xf8:
  58                 data_addr = (data_addr & 0x00ff) | (data << 8);
  59                 break;
  60         case 0xf9:
  61                 data_addr = (data_addr & 0xff00) | data;
  62                 break;
  63         case 0xfa:
  64                 if(data_buffer[data_addr & ADDR_MASK] != data) {
  65                         data_buffer[data_addr & ADDR_MASK] = data;
  66                         modified = true;
  67                 }
  68                 data_addr++;
  69                 break;
  70         }
  71 }
  72
  73 uint32_t CMOS::read_io8(uint32_t addr)
  74 {
  75         switch(addr & 0xff) {
  76         case 0xf8:
  77                 data_addr = 0;
  78                 return 0xff;
  79         case 0xf9:
  80                 return data_buffer[(data_addr++) & ADDR_MASK];
  81         }
  82         return 0xff;
  83 }
  84
  85 #define STATE_VERSION   1
  86
  87 bool CMOS::process_state(FILEIO* state_fio, bool loading)
  88 {
  89         if(!state_fio->StateCheckUint32(STATE_VERSION)) {
  90                 return false;
  91         }
  92         if(!state_fio->StateCheckInt32(this_device_id)) {
  93                 return false;
  94         }
  95         state_fio->StateBuffer(data_buffer, DATA_SIZE, 1);
  96         state_fio->StateUint32(data_addr);
  97         state_fio->StateBool(modified);
  98         return true;
  99 }